To: igsstation@igscb.jpl.nasa.gov Cc: nacho@canaryadvancedsolutions.com, Javier.Tegedor@esa.int Subject: [IGSSTATION-2953]: Historic clock information of PERT, NNOR, MAS1 and KOUR added Message-ID: From: Pedro.Alfaro@esa.int Date: Thu, 26 Mar 2009 18:46:42 +0100 Content-Type: text/plain; charset="us-ascii" Sender: owner-igsstation Precedence: bulk ****************************************************************************** IGS Station Mail 26 Mar 10:47:16 PDT 2009 Message Number 2953 ****************************************************************************** Author: Pedro Alfaro Sanz Dear colleagues, Some of our IGS stations have had in the past some problems with their external reference clock. We have used our repro1 solutions to analyse their behaviour in the period 2000-present, and have reflected the results in new versions of the station logs of PERT, NNOR, MAS1 and KOUR. These logs have just been submitted to IGSCB. It seems that there are several periods of time where our receivers reverted to their internal clock, although the external clock was connected. We think this might have been triggered by some sort of maintenance activity at the station. We are working to catch these problems as they occur from now on. Other than these problems, the logs just submitted also reflect that: KOUR has been an H-maser since Jan 2008 PERT is no longer connected to an external clock NNOR has been reclassified as a SLAVED CRYSTAL We would like to thank Jim Ray for the "heads up" on this issue. Kind regards, Pedro Alfaro ______________________________ Pedro Alfaro Sanz Msc. Aerospace Engineer GMV Aerospace and Defence S.A. +49 6151 90 4069 Pedro.Alfaro@esa.int Navigation Facility, OPS-GN European Space Operations Centre Robert Bosch Strasse 5 64293 Darmstadt Germany